Theft alarm



Oct. 23 ,.1923. v 1,411,733

C. A. ISBELL THEFT ALARM Filed Feb. 5, 1920 To 12 35 wiwm it may (renown Be it known that K, CHABLEE Ismmo a. ci'cizen' of tho Upitaci States, raiding Posooeno, in the county of Los Angeies am Stote oi (kzlifomisi have invem'ecl new 2.1161 useful lmprovemento in Theft which the followiilg is a specification.

This invention relates to theft for? vehicles and pai'ticulori'y to amonlooiios, and has for its vobjoci, to provide device this kind that is simple in comi scuction is T- lio'blo, can r eadily ho ifistalied in combination with tho usual ignition circuit of motor driven vehicles. and that is key controiie'i; andtho invention consisi's of theconstructisfil, the combination 21.11: in details anol armngomonts of tho an embodiment of which invention is illustrate? in tho 'ao companying drawings and csesm'ibed and claimed herein.

Figure 1 is a, pm or top end vEoW oi tho device'portly in section.

Fig. 2 is a soctional vim-v on Kim 2-42- of Fi 1.

Big. 3 is; osoot'ionol Fig. 2. Fig. 4 is odiagmmmotic view of tho in in the apparatus. f

ho invention comprises the, organization, in combination with tho usual ignition oi;- ouit of o, mocor driven vohio1o.,'o;'? 3, signal io vice that mew,- and preferably floes, consist of a bell or other ou'libio alarm means means-designed two so set elements in the. o pamtus that upon. the closing of the ignition circuit controlling switch wiT'hout tho nipulotion of the parts by the use of o PTQIQGY key fixozo Wm. than be given a signal to twat attention to tho oifsmpfrod szfiamting tho IUOtOi.

The apparatus is toohed as a unitat anydesired position upon the vehicle immature and in such Ioooiioo that it can in readily. omessibie to "'shoso familiar with the location for tho insoflxi on of a controlling or operating'key.

In its illustrated foray the invontiowtl includes a suitable; reoopmcie or km. 52 having a cylinder lock 3 to be tumedby a complementary key 4 the cylinciex" of the lock having a lover or' contact blazie 5 wronged mathin the box 2 and which when turned in one position, as shown 'in Figs. and 4, is

View on lino S- of A kiosigned to emgogo with imsulaeodfcontocts copo'hlo of being oh (5 Tho 0011651433 5 s siiown 2:5 com Rocked o is.v Wire 8 io a, line: S) which is broken 10 and is pyovidoci with spaced contacts A 12, the lotto: com-ad being; congested io 23 who 13 shown as extended to 2m m-ziuotion coil 15?: which iscoxmected in min to one Contact poor of a main or ignition circuit. switch 15 This; switch is com'iootecl by '1 wire; 16 to a some-o of ailment, indioaitofl & hotter 1? which is groonriod no 1 t From tho wont-amt there is ext-ended wire, 19 which is connectod to tho motor vi 5 firming o of the ground 18.

Wili. theroforo he soon tho-t when the switch Mode 5 is turned 'izooompieto filo oi oujt at tho contwts (i current will fiova', when no switch 15 is olosooi, from the boi- "foery 1'? and switoh 15, tiwough (foil 14:, lino 13 to tho contact 12 which is insulotofi from tho oonmo': l1 and for the; completion of tho irouiii: at tho Wop 1% there is provided a m cipromfiitog mo 72% in ibis case, Sawing its.

upper aflopbed to engage tho com-(imam contacts iii-A52.

Tho contact rod 201s proviflod with 351mmiij ahe form of a disc 91 which is shovm n 2 as engaged by a pin or dog c to port do 5.

the yl'mierz' look, as Thm fio Hie i062: cylm ior mnemonciosmg the carom-ii;

21?: o Iaifbing tho comma; roi in one opomiion so film; whom oh'ouifit is s'iosoc' the contacts 11 oml 12; the circuit will then comp? $213 through Cshe iinos i-)-8, contac tsfi onfi line 19 to aoho mofior v0 suppiy cur-rent Lo the igniting appomtus of system including the usuai spm'k gaiugs notshown.

Tho operator of the which esiring to lemvo the sama may insor. the key i in filo lock 3 ani mm tho oylinior so as to break. circuit .03; withdrawing the; Contact blolo 5 from tho cookout 6 and. turn the biaxlo uniii it wifi. ongoge co-omiinato contact membars 2% 2-3, the Eotu'or bein connector to the gl'ounfi #11319 to tho common 22%?(1918 i8 23?, tacked a Wire connected to 0116 iorminol of a soienoifi coil 25 from the opposite fiemgaino of which there oizion is a "Wilfi 26 which 5;; shown as copped mm the; iino 9.

Since the comoefi mombor 20 has been in frictional ongagement with the sin-0rd note contaos 11 and 12!; o circuit thereforo 7 W13 pass throuoh tho mi 5:35 to lino 9 ammo contacts 11-12.

Uponthe retractionof the solenoid eore 20 .the disc 21 is brought down to contact with and These contact members may he mounted and insulated from the eo The wontact 26 is connected to a wire 2* tapped into the iine 16,nnd the contact 2? rounded as at 29. in the line 28 there is arrange-Ci any suitable electrical or eleetroznagnetio signzii device, in the present ease. shown as comprising an electric hell 30.

From the above it will be seen that after the switch 5 has been turned by the key i'to close the circuit at the oontarts the coii 25 will be energized while the switch 15 is still closed and the (:ireuit will then be broken at 11-42 by the rem-notion of the circuit closing member 20. and at the same time the aiarm circuit will he coinpieied by the engagement of the meiuher 21 rviih the contaets 26-2T and an alarm estahlished by the energization of the signal device 30. The operator then simply breaks the circuit, if not open at the ignition circuit switch 15 by opening the same.

Any person then who attempts to start the motor o closing the ignition circuit switch 15 will in consequence give the alarm by the device and this can only be prevented by the insertion of a proper key int the lock so as to break the i snitabiy arranged contact memhe wi th hell circuit by ii Contact member .21 from engagem the heii circuit Contact.

What is claimed is:

1. The combination, with an him: hustion engine ignition rir main ignition switch and throtad Lin switches, two of whit-her, in the circuit, of a. koy-vontrollod means ior nntely eqpeniu', and closing: one or? srilu switrhos and the third sn'iu-h, a solenoid in and circuit having a core provided with means for opening the (rirquit at our of the switches in the ignition Circuit when error.

gizvd. said Swim-h inoluding means For keeping the circuit closed thereat when lilo soic-- ing and (dosing one of said switohos and ulna third switch. a solenoid in said circuit having: a core provided with means for opening the cir nit at one of the switehes in the ignition circuit "when energized said switch inciuding means for keeping tho cii'euitoiosed thereat when the soionoid is doenergized. a shunt around the soienoid inrludin z the third switch. means operative hy the l 0"\' 1 trolled means for moving the solenoid core operated means to circuit-e1 sing position on the movement of the third switeh to circuit closing position, an alarm.- a normally ooen alarm circuit, and means operated by I i; solenoid to open the ignition chi-nit and To close the alarm circuit.

in testimony whereof I have signed my name to this specification CHARLES A. LJBELL 

